Lifting bridge.



PATENTED JUNE 16, 1908.

M. WADDELL. LIFTING BRIDGE.

APPLICATION TILED FEB-12, 190B.

3 SHEETS-SHEET 1! wwwmao No. 890,947. PATENTED JUNE 16, 1908. M. WADDELL.

LIFTING BRIDGE.

APPLIUATION FILED I'EB.12, 1908.

3 SHEETS8HEET 2.

PATENTED JUNE 16, 1908.

M. WADDBLL. LIFTING BRIDGE. APPLICATION FILED PEB.12,1908.

3 SHEETS-SHEET 3.

13% bn w New type MONTGOMERY WADDELL,-OF NEW YORK, N.

LIFTIN G BRIDGE.

Specification of Letters Patent.

Patented June 16, 1908.

Application filed February 12, 1908. Serial No. 415,586. I

To all whom it may concern: 1

Be it known that I, MONTGO ERY WAD- DELL, a subject of the King of Great Britain, residin theeity, county, and State of ork, have'inventcd a certain new and useful Im rovement in Lifting Bridges, of which the ollowing is a specification.

The resent invention has relation to that f draw-bridge wherein one or two sections of bridge are arranged to turn up out of the way of navigation around a stationary trunnion or pivot u on its abutment or pier and the principal 0 jcct of the invention is the provision of im roved means for so counter-balancing t 1e bridge during its movement up or down that the rotativc moment exerted by the weight of the bridge in one direction 18 always ap roximately equal to'the rotative moment o' a counterweight in the o posite direction, while at the same time the iiridge in either extreme position is securely braced against the wind pressure in such a way that the resistance of such pressure is exerted through a long lever arm.

Another object of the invention is the provision of an improved means for causing the necessary movements of the bridge, what ever the counterweight arrangement may be.

One advantage of my invention is that the ends above named are secured by means of great strength, simplicity and reliability and without resorting to )ivotal attachments oi the counterweight either to the bridge itself or to exterior tower or piers.

My invention is illustrated in. the accompanying drawings wherein Figure 1 shows one form of bridge. provided with my invention, in side elevation, with the lifting section in its lowered position, Fig. 2 is .a similar viewof another form of bridge, F igs.

3 and 4 show the same bridges, in side elevation, and in raised position, Fig. 5 is an end view showing the counterweight and preferred bridge operating means, and Fig. (i is a side view of the apparatus shown in .Fig. 5.

A brid c section of any well known form is indicate at 1, the same being pivoted at 2 to suitable foundations on the piers 3.

In Figs. 1 and 3 is shown a bridge adapted to-swin between, suitable side supports 4 preferab y provided with lateral bracing in- (heated in dotted lines at 5 and uniting the su ports on opposite sides of the bridge.

11 Figs. 2 'anr 4 the bridge is shown swing- 111g." bObWCOIli SJLlO SUPPOI'tS 6 01' a somewhat uppr--.rfo1wvard corner downward and rearwardly, as shown in the drawings. Each guide 9 is rovidedwitha raised rack 10 placed preferaijly mid-way of the width of the uide as shown in Fig. 5. The in-board end of the tilting bridge section carries a movable counterweight so su) orted and arranged with respect to the brn ge and the guide-way 9 that its weight exerts a wedging action be tween the bridge and guide -way tending to lift the bridge. For this purpose the opposite sides of the movable bridge section are provided with suitable slots or guideways 11 which may be inclined to the vertical when the bridge is down as shown in Figs. 1 and 2 or mayhave such 10111'1 or direction as is consistent with the operation of my device in any given structure.

The. counterweight 12 extends across the bridge from side to side opposite the slots 11 and is preferably constructed, as shown in Figs. 5 and 6, with rollers'13 extending into said slots and having appreciable play so that they may roll against either face of the slot, and provided with extensions 14 having a corresponding play within the slots. On the opposite sides of the counterweight 12 are pivoted two rollers 15 bearing upon the smooth portion of the guides 9, and these rollers are preferably provided with in-set gear teeth 16 meshing with the rack 10, for the purpose of moving the bridge up and down by the-use of mechanism carried by the counterweight. It is to be understood, however, that m ybroad invention does not neces- 'sarily include the mechanism thus ,situated on the counterweight for moving the bridge.

In the preferred form shown the rollers 15 are united by shafting 1 7 extending across the counterweight to a bearing 18. Spur wheels 19 are fixed intthe shafting 'lfand arc driven by pinions .20 "whieh'flmay or 11180 not be 

